Somehow, it has all morphed again. One day last week he stated emphatically, "I am boogers!" at pickup time. I mostly succeeded in not bursting out laughing (since I'm just a 12 year old boy inside) but now he likes to say "cheerio nekkit boogers" with a giggle, just to see how I will react. And he still seems to think he IS boogers on occasion. (Don't we all?)
Yes, I know this is only the beginning. Now that we have boogers, farts (known at our house as "a bit of wind") are surely on the horizon, followed by who knows what else. Can't wait.